Dependabot/gh-actions: move to bi-weekly schedule #153

Job	Run time
QA / Check XML	29s
QA / Test: PHP latest - PHPCompat stable	14s
QA / Test: PHP 5.4 - PHPCompat stable	32s
QA / Test: PHP 7.4 - PHPCompat dev-develop as 10.99.99	11s
	1m 26s

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